Permissible Radial Forces for the Output Shaft

If there are radial loads on the output shaft, they should be compared with the permissible values for radial forces.

The values in the table for the permissible radial forces apply under the following conditions

• gear unit with solid output shaft, normal shaft ends
• constant load in continuous operation
• radial load on the middle of the output shaft in the case of worst load direction
• no axial forces

If the radial force is not applied to the middle of the shaft, use the following formula for the conversion of the permissible radial force:

$\mathrm{FRx1}=\mathrm{FR1}·\frac{\text{1}}{1+\frac{x}{\mathrm{K1}}}$

$\mathrm{FRx2}=\mathrm{FR2}·\frac{\text{1}}{1+\frac{x}{\mathrm{K2}}}$

$\mathrm{FRxp}=\min \left(\mathrm{FRx1}\text{;}\mathrm{FRx2}\right)$

FR1 [N]

permissible radial force for bearing lifetime
application at middle of output shaft (table)

FR2 [N]

permissible radial force for shaft strength
application at middle of output shaft (table)

K1, K2 [mm]

Constant (table)

x [mm]

Distance (subject to sign, see sketch)

FRx1 [N]

permissible radial force for bearing lifetime
application at point x

FRx2 [N]

permissible radial force for shaft strength
application at point x

FRxp [N]

total value of permissible radial force
application at point x

The radial force determined from the application must not exceed the permissible radial force for the gear unit.

In certain conditions, the gear unit is able to accept higher radial forces.

If no radial force is applied, the permissible axial force for the gear unit is 50% of the calculated permissible radial force.

If the radial forces found for a special drive application are higher than the values in the table, or if radial and axial forces are acting at the same time, consultation with the manufacturer is necessary.

Solid output shaft, application of force at middle of shaft, normal bearings

Hollow shaft, application of force at end of hollow shaft, normal bearings

Solid output shaft, application of force at middle of shaft, reinforced bearings

Hollow shaft, application of force at end of hollow shaft, reinforced bearings

Output shaft material: tempered steel 42CrMo4+QT, application of force at middle of shaft

The values FR1 und FR2 are guidelines for normal use without application of axial forces.

In certain conditions of force application, the gear unit is able to accept higher radial forces.